Furnace.



J. M. BROOKS.

FURNACE.

APPLICATION FILED 3111.17, 1910.

vIvatented May 24 L 6 I J [N VEN T OR Attorney;

UNITED STATES PATENT OFFICE.

JOHN M. BROOKS, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONEHALF TO EDWIN W.

AnAMs, or BALTIMORE, MARYLAND.

FURNACE.

Specification of Letters Patent.

Patented May 24, 1910.

To all whom it may concern:

Be it known that I, JOHN M. BROOKS, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Furnaces, of which the following is a description, reference being had to the accompanying drawing, and to the numerals of reference marked thereon.

The invention relates to new and useful improvements in furnaces, and more especially to devices for controlling the intake of air when the furnace door is opened.

Upon the opening of a furnace door, the cold air rushes therein, and not only deadens the fuel, but also chills the pipes or fines in the furnace, causing undesirable results even when it is desired to check the fire.

An object ofthe invention is to provide means for diverting a part of the draftthrough the Open furnace door, which means operates automatically to restore the normal stack or pipe draft when the door is closed.

The invention consists in the parts and improvements hereinafter described and set forth in the appended claims.

In the drawings which show by way of illustration, one embodiment only of the invention,-Figure 1 is a sectional view through the furnace, showing my improvement ap plied thereto; Fig. 2 is an enlarged sectional view through the automatic damper; Fig. 8 is an end view of the same; and Fig. 4; is an enlarged detail in section, showing the damper open to receive the outer air direct to the stack.

The furnace 1 is of the usual construction, and consists of a fuel chamber 2, which is closed by a door 3, through which fuel may be supplied to the fuel chamber. An ash pit 4 is also closed by means of a door 5. The furnace as herein shown, is provided with the usual bridge 7, and a boiler 8, having the usual tubular flues through which the heated gases pass from the fire chamber to the stack 9. These parts are of the usual construction, and will not need further description.

When the furnace door is opened, in order to feed the fuel chamber or to check the fire, the cold outer air rushes in through the open door, and not only deadens the top of the fire very quickly, but also passing through the heating flues, cools the said fines to an undesirable extent. I

In order that the intake of cold air through the door when it is opened, may be decreased or modified, I have provided a damper 10. As herein shown, the damper is attached to the stack 9, which is formed with an opening 11. A short sleeve or pipe 12 is securedto the stack 9. Within the short pipe 12 is a flanged diaphragm 13 having a central opening 14 formed therein. A. disk 15, which is of slightly less diameter than the pipe 12, is adapted to engage the diaphragm 18 so as to close the opening lt, or to move away from the same, so as to allow a free inrushing of the air through the opening 14 to the stack 9.

The disk 15 is carried by a bar 16, which is pivoted to parallel links 17 and 18, which links are in turn pivoted to suitable brackets carried by the pipe 1.2. The link 17 extends below its pivotal connection 19 with the bar 16, and is slightly deflected, as clearly shown in Figs. 1 and 2.

The lower end of the deflected portion of the link 17 is threaded at 20 to receive the weight 21, which may be adjusted toward and from the end of the link 17. The weight 21 and the pivotal connections between the links 17 and 18 and their supporting brackets, and also the pivotal connections for the bar 16, are so disposed that the weight 21 under the action of gravity, will withdraw the disk 15 from the diaphragm 13, holding the damper open, so as to allow the free inrushing of the air, as clearly shown in Fig. 4, and as shown also in dotted lines in Fig. 2. Said links will, however, allow the disk to move so as to close the opening when the inrushing of the air through the opening 15 becomes very rapid, owing to increased suction in the stack.

In the operation of my device, the weight 21 is so proportioned that when the door to the fuel chamber is closed, the normal vacuum of the stack will hold the disk 15 against the diaphragm 13, or the damper closed, which gives a full normal draft in the stack. When, however, the door to the fuel chamber is opened, the vacuum in the stack will at once decrease, and as this vacuum decreases, the weight 21 will be suflicient to overcome the force of draft on the disk 15, and will move the disk 15 away from the diaphragm 13, allowing the outer air to pass through the pipe or sleeve 12, directly into the stack 9. This will divert a certain amount of the air drawn into the stack, and reduce to a certain extent, the amount of air drawn in through the open furnace door. Inasmuch as the air is taken direct to the stack, it does not come in contact with the heating flues, and, therefore, the flues or the boiler will not bel chilled, and,furthermore, the fire will not be too quickly chilled or checked. As soon as the furnace door is closed, the normal draft in the stack is restored, and the disk 15 will be drawn against the diaphragm 13, thus closing the damper.

While I have shown my invention and described the same in connection with a furnace for heating a boiler, it is obvious that the invention is adapted for use in connection with hot air furnaces, or any other type of heating chambers wherein it is desired to prevent the too sudden checking of the fuel,

or the chilling of the fiues by the direct in rushing of cold air through the open door leading to the fuel chamber.

While I have referred to the part 9 as a stack, it is understood that this term is used with the intention of covering the pipe or flue leading from the furnace, and that the automatic damper may be connected at any desirable point between the heating flues and the chimney.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination of a fuel chamber, a stack connected therewith, a door for closing said chamber, a damper connected with said stack, said damper including means operable directly by suction due to the vacuum in the stack, whereby the same is open when the door is opened and whereby said damper is closed when the door is closed.

" 2. The combination with a fuel chamber, a stack connected therewith, a door for closing said chamber, a damper connected with said stack, said damper including a disk, a diaphragm having an opening against which the disk seats, means for supporting said disk, whereby said disk is normally held closed by suction due to the vacuum in the stack, when said door is closed, and means for overcoming the suction, and opening the damper when the vacuum in the stack is decreased by the opening of the door.

3. The combination of a fuel chamber, a stack connected therewith, a door for closing said fuel chamber, a damper connected to said stack, said damper including a disk, a diaphragm having an opening against which said disk seats, a bar connected to said disk, parallel links for supporting said bar, whereby said disk may be moved toward and from said diaphragm, one of said links having a deflected extended portion and a weight adjustably connected to said extended portion.

In testimony whereof I aflix my signature, in presence of two witnesses.

JOHN M. BROOKS.

Witnesses:

ROBERT H. GERBIG, HENRIETTA KELLY. 

